Preheat oven to 325 degrees F. Grease a 9×13-inch baking pan and set aside. You can line the pan with parchment paper, if desired.
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
Using a stand mixer or hand mixer, beat the butter on medium speed in a large bowl until smooth and creamy. Add both sugars and beat for an additional 2 minutes, or until well incorporated.
Add the eggs and vanilla and mix until combined.
Add the dry ingredients and mix on low until just combined. Don’t over mix.
Stir in the Cadbury eggs, chocolate chips or chunks, and coconut. Use a spatula to scrape the blondie batter into the prepared pan. To make the blondies extra pretty, you can gently press additional Cadbury mini eggs on top of the blondie batter. Sprinkle with flaky sea salt, if desired.
Bake for about 35 to 40 minutes, or until a toothpick or knife inserted into the center comes out clean. The blondies should pull away from the sides of the pan a little and the top should be golden brown.
Remove from the oven and let the blondies cool completely before cutting into squares.
Notes
To chop the Cadbury eggs, place them in a Ziploc bag and smash with a rolling pin. Make sure you don’t smash them too much; you don’t want them completely crushed.